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Topic: Compile error for board NodeMCU 1.0 (ESP-12E modules). (Read 178 times) previous topic - next topic


Hallo everybody,

i would like to compile my sketch in the arduino IDE. Till yesterday the sketch still worked. But now i cannot compile my sketch. I haven't changed anything in the program.

I have copy the url:"http://arduino.esp8266.com/stable/package_esp8266com_index.json" in the presets.

This is my board: NodeMcu 12E

A picture ist in the attachment

please can you help me

Thank you


Retaxx's screenshot error message.PNG:

The "Board ... is unknown" error occurs when a Boards Manager installation of a different version of a hardware package fails to completely uninstall the previous version. Here's how you solve it:
  • Click the link on the line following File > Preferences > More preferences can be edited directly in the file. This will open the Arduino15 (or similar name depending on OS) folder.
  • Navigate to the packages/esp8266/hardware/esp8266 folder.
  • You will see two folders. One is named by the version of the package you currently have installed, the other is named by the version of the package you previously had installed. Delete the folder with the previous version name. Please be very careful when deleting things on your computer. When in doubt back up!


okey great. Thank you very much.

Now its working perfektly.


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